"George Dishman" wrote in message
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"Dr ***" wrote in message
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"Harry" wrote in message
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"Dr ***" wrote in message
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Vacuum, Velocity, Gravity and the Speed of light.

*************** Simplified *****************

The following are simple provable or logically deducible facts

a) The speed of light (SOL) is measured constant in vacuum and also in
any
given medium. Its speed in vacuum is given the designator c.

As I already explained to you, ONLY when the medium is at rest wrt the
measurement system!

In a medium, the speed is c/n where n is the
refractive index.
dr
Thanks
George